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Old 2nd August 2012, 08:21 PM   #1
diyAudio Member
Join Date: Aug 2012
Default Building a spring reverb unit


i am in the midst of making a spring reverb unit, it is my first electronics project and i could use some help from some people who are more knowledgeable on the subject than i am.

i have an Accutronics reverb tank model 8DB2C1D and i have some preamps from maplin. So far i have got the reverb driver, and the recovery amp working, but there are some modifications and additions i would like to add, but don't quite know how to go about it.

For the reverb driver i have used a 1 watt amplifier N48FL (see attachment)
I have got this to drive the strings in the reverb tank quite nicely but only when i power it with a 12v dc supply connected in parallel with a 9v battery.

For the recovery amp i have used a low noise stereo preamp N47FL (see attachment) this amplifies the reverberated sound nicely as well, I am also powering this preamp with 12v dc in parallel with a 9v battery.

i would like to add an op amp mixer so i can control the wet/dry mix using pots. Can anybody advise me on how to go about this please?

i have attached the pcb data sheets and a picture of my project so far


Attached Images
File Type: jpg project.jpg (980.1 KB, 110 views)
Attached Files
File Type: pdf N48FL (1w amp).pdf (95.6 KB, 26 views)
File Type: zip (469.5 KB, 11 views)
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Old 5th August 2012, 06:00 PM   #2
diyAudio Member
Join Date: Nov 2010
Location: England Hertfordshire
if you need another battery in parallel, it sounds as if you dont have enough current available in the power supply, and 9v battery on a 12v supply cant be doing anything any good.

looks like the recovery amp has a volume control so this would control the "wet" signal, so you just need a summing amp, which is a standard inverting op-amp gain stage but with a paralleled input
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Old 6th August 2012, 05:11 PM   #3
diyAudio Member
Join Date: Aug 2012
thanks, ive got myself an inverting op amp for the summing amp, and a new power supply, im going to put it together tonight and see how it goes
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Old 7th August 2012, 04:59 PM   #4
diyAudio Member
Join Date: Oct 2011
Location: Somewhere in Germany
Here you will find the desired informations, I think. Go to APPLICATION and be happy!

Best regards!
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